class Settings:
    """存储游戏《外星人入侵》中所有设置的类"""

    def __init__(self):
        """初始化游戏设置"""

        # 屏幕设置
        self.screen_width = 1400
        self.screen_height = 800
        self.bg_color = (30, 30, 30)

        # 飞船设置
        # self.ship_speed = 1.5
        self.ship_limit = 3

        # 子弹设置
        # 速度
        # self.bullet_speed = 1.5
        # 宽2像素、高15像素
        self.bullet_width = 15
        self.bullet_height = 3
        # 颜色
        self.bullet_color = (255, 255, 255)
        # 数量
        self.bullets_allowed = 3

        # 外星人设置
        # 速度
        # self.alien_speed = 1.0
        # 下移速度
        # self.fleet_drop_speed = 10
        # 左移速度
        self.fleet_left_speed = 10

        # fleet_direction为1右移，为-1左移
        # self.fleet_direction = 1

        # 控制游戏节奏的加快速度
        self.speedup_scale = 1.1

        # 记分
        # self.alien_points = 50
        # 提高外星人得分
        self.score_scale = 1.5

        # 玩家提高等级，节奏翻倍
        self.initialize_dynamic_settings()

    def initialize_dynamic_settings(self):
        """初始化随游戏进行而变化的设置"""
        self.ship_speed = 1.5
        self.bullet_speed = 3.0
        self.alien_speed = 1.0

        # fleet_direction为1右移，为-1左移
        self.fleet_direction = 1
        # 记分
        self.alien_points = 50

    def increase_speed(self):
        """提高速度设置"""
        self.ship_speed *= self.speedup_scale
        self.bullet_speed *= self.speedup_scale
        self.alien_speed *= self.speedup_scale
        # 提高外星人的分数
        self.alien_points = int(self.alien_points * self.score_scale)
